... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2012 June 21 . WR 134 Ring Nebula . ... Embedded in the region's interstellar clouds of gas and dust, the complex, glowing arcs are sections of bubbles or shells of material swept up by the wind from Wolf-Rayet star WR 134, brightest star near the center of the frame. ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

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• APOD: 2000 June 9 - Vela Pulsar: Neutron Star-Ring-Jet
• APOD: 2003 June 22 - Massive Stars of 30 Doradus
• APOD: 2013 June 5 - M57: The Ring Nebula

... WR 134 Ring Nebula . ... 21.06.2012 . ... Embedded in the region's interstellar clouds of gas and dust, the complex, glowing arcs are sections of bubbles or shells of material swept up by the wind from Wolf-Rayet star WR 134, brightest star near the center of the frame. ... Shedding their outer envelopes in powerful stellar winds, massive Wolf-Rayet stars have burned through their nuclear fuel at a prodigious rate and end this final phase of massive star evolution in a spectacular supernova...

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• A Massive Star in NGC 6357
• Vela Pulsar: Neutron Star-Ring-Jet
• X Ray Stars and Winds in the Rosette Nebula

EMBARGOED UNTIL: 9:00 A.M. (EDT) June 10, 1999 PHOTO NO.: ... Credit: M. Heydari-Malayeri (Paris Observatory ) and NASA/ESA NOTE TO EDITORS: Image files are available on the Internet at: http :// oposite.stsci.edu / pubinfo /pr/ 1999 /23 or via links in: http :// oposite.stsci.edu / pubinfo /latest.html http :// oposite.stsci.edu / pubinfo /pictures.html Higher resolution digital versions (300 dpi JPEG and TIFF) of the release images are available at: http :// oposite.stsci.edu / ...

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• http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/ISM/StarTear.txt
• APOD: 2000 June 13 - The Keyhole Nebula in Infrared
• Hubble Uncovers Dust Disk Around a Massive Black Hole (STScI-PRC98-22) A

Photon Scattering: Basic Principle of Photon Scattering . Audio Narration is available . No Scattering: Photon Source and Detector . ... For optical photons, scattering goes as wavelength to the -4 power. In the case of blue photons compared to red photons, this means that blue photons are about 10 times more likely to get scattered than red photons. ... Watch the blue photons scatter away from the detector . ... Interstellar dust make stars appear redder than they really are . ...

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... Science . ... Science Users Information > Science and Technical Meetings > Conferences 2010 > Central Massive Objects: The Stellar Nuclei - Black Hole Connection . ... Science Users Information . ... Observing with ESO Telescopes . ... Science Software . ... ESO Science Newsletter . ... An ESO workshop for observers and theorists to discuss recent progress in our understanding of the formation and evolution of black holes and star clusters in the centres of galaxies and their connection to each...

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• ESO - Stellar End Products: The Low Mass - High Mass Connection
• ESO - Thesis Topic: Testing the non-universality of the low-mass end of the
• ESO - Fornax, Virgo, Coma et al., 27 June - 1 July 2011

... ATNF Home . ... About ATNF overview . News | ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... Now, new Australia Telescope observations of the polar ring galaxy NGC 4650a suggest that the dark matter in this galaxy lies in a flattened distribution aligned with the polar ring. ...

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• ATNF_publications
• Radio's role in studying massive stars
• ATNF Colloquium

... GSAOI Home . ... Science . ... Deep imaging at J , H , and K is required to identify all stellar objects, brown dwarfs, and planetary mass objects in the central region of the Orion Nebula Cluster down to masses comparable to that of Jupiter. This is required to establish the initial mass function, i.e., the number of stars of each mass that have formed, in this region of intense massive star formation. ... The fields of the GSAOI detectors are shown as four green squares in each frame. ...

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... Mass loss Recipes | ... Mass Loss is the most important "driver" of stellar evolution in massive stars. ... The final goal is to predict mass loss over the entire evolution of a massive star at all cosmological epochs. ... Very Massive Stars are objects up to 300 times the mass of the Sun. ... Mass-loss rates increase dramatically when objects cross a critical Eddington Gamma factor (Vink et al. ... I have recently edited a book on "Very Massive Stars" including a mass-loss "chapter" . ...

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• Jorick Vink
• C. Refereed Journal Publications 2002
• Mass loss recipe "Jorick Vink"

... Bad Astronomy . ... Bitesize Astronomy . ... Have you ever looked at pictures of Saturn's rings and noticed what look like gaps in the rings? ... Gian Domenico Cassini discovered a large gap in Saturn's rings in 1675. Later, an astronomer named Encke discovered a smaller gap near the edge of the rings. ... It was found long ago that an orbit in the Cassini Division, as the large gap is named, has a period almost exactly one-half that of one of Saturn's moons named Mimas. ... 2008 Phil Plait. ...

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... Neptune is smaller in diameter but larger in mass than Uranus . ... N eptune has been visited by only one spacecraft, Voyager 2 on Aug 25 1989. ... A t the time of the Voyager encounter, Neptune's most prominent feature was the Great Dark Spot (left) in the southern hemisphere. ... Neptune's winds blew the Great Dark Spot westward at 300 meters/second (700 mph). ... L ike Uranus and Jupiter, Neptune's rings are very dark but their composition is unknown. ... Neptune's Ring System . ... Uranus .. ...

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• Amalthea
• Uranus
• The Sun

We present Hubble Space Telescope ultraviolet spectra and supporting ground-based data for a sample of nine intermediate-mass T Tauri stars (IMTTSs; 1.5-4 Msolar). ... We compare our simultaneous optical-UV data with predictions from accretion shock models to get accretion luminosities and mass accretion rates (M) for the targets. ... Finally, we find that the relation between accretion luminosity and BrнЕ luminosity found for low-mass T Tauri stars extends to the intermediate-mass regime. ...

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• HST this week: 155
• Swara's Publications
• Dust disk around a black hole in galaxy NGC 7052

... According to the most popular cosmological paradigm, the greater part of the galaxy mass is accumulated in the dark matter halo. ... The polar ring galaxies (PRGs) reveal external rings or disks of gas, dust and stars rotating in a plane roughly perpendicular to the disk of the central galaxy. ... The shape of the dark halo in the model was chosen so as to achieve the best fit to the observed rotation of both galaxies themselves and their polar rings. ... The SPRC-7 galaxy. ...

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• Detection of unique bright radio flare of X-ray binary
• articles_olga_eng
• New LBV Star Discovered in the Galaxy

Astronotes Armagh Planetarium's Stellar Blog! ... Milky Way . Stars . ... This dramatic image depicts Omega Centauri, one of 200 or so globular clusters orbiting our Milky Way galaxy. ... Swarms of tightly packed stars, numbering in the thousands to low millions, globular clusters are cosmic fossils, relics of the early times of our galaxy. Omega Centauri may actually be the core of a smaller galaxy ripped apart and assimilated by our own Milky Way in the distant past. ...

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• Tarantula Nebula in stunning Hubble Image | Astronotes
• Vesta: Asteroid seen by Dawn spacecraft | Astronotes
• Saturn | Astronotes - Part 2

... The RAS Meteorite Collection: State on the 1 st of June, 1999 . ... About the laboratory . ... Fall 15 June 1900. One mass of 37.5 kg . ... Chondrite . ... Find 1958. 19 masses totaling 9500 kg . ... One mass of about 73 kg . ... Fall 12 April 1864. 2 masses totaling more than 10 kg . ... Find 1894-1899. 28 masses totaling about 50 kg . ... One mass of 5858 g . ... Find 1917, recognized 1932. 2 masses of 3 kg and 1.15 g . ... One mass of 4020 g . ... Find 1875. 8 masses totaling 266 kg . ...

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home publications > mercury . ... Rings of Creation . ... In 1755, Immanuel Kant had the remarkable insight that stars and planetary systems form by the gravitational collapse and rotational flattening of interstellar clouds. Later in the 18th century, Marquis Pierre Simon de Laplace refined Kant s idea by suggesting that planets condensed from rings produced at the edge of a contracting disk while the Sun formed at the center a picture thereafter known as the Nebular Hypothesis. ...

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• ASP: Contents, May/June 2003
• ASP: Big Clusters, Tiny Galaxies
• ASP: Contents, May/June 2005

... Posts tagged ?massive data? ... Tags: bimodality , chi-square minimization , Classification , CMD , Estimation , machine learning , massive data , model based , PCA , spectral analysis , spectroscopic , survey , VO . ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray . ...

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• The AstroStat Slog 2010 June
• The AstroStat Slog workshop
• The AstroStat Slog Blog Archive [ArXiv] Spectroscopic Survey, June 29, 2007

... Session 1 - Stars, star formation, stellar populations and planets . 9.20 10.00 . ... HST Spectroscopy of the Hottest White Dwarfs . ... Coffee break . ... Lunch break . ... A (long) look at neutron stars with HST . ... Session 2 - Nearby galaxies, bulges, spheroids, galaxy formation . ... New HST/ACS Insights into the Evolution of Star-Forming Dwarf Galaxies with Extreme Properties of Cosmological Relevance . ... Deriving properties of Lyman-break galaxies at z~3-5 using HST/VLT/Spitzer data . ...

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... Interacting galaxies . ... Catalogues . ... We define a volume limited sample of over 14,000 early-type galaxies (ETGs) selected from data release six of the Sloan Digital Sky Survey. The density of environment of each galaxy is robustly measured. By comparing narrow band spectral line indices with recent models of simple stellar populations (SSPs) we investigate trends in the star formation history as a function of galaxy mass (velocity dispersion), density of environment and galactic radius. ...

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• Publications | Matt Bothwell
• Astrophysics Group Highlights & News
• The history of star formation and mass assembly in early-type galaxies Bojan

... Wispy tendrils of hot dust and gas glow brightly in this ultraviolet image of the Cygnus Loop nebula, taken by NASA s Galaxy Evolution Explorer. The nebula lies about 1,500 light-years away and is a supernova remnant, left over from a massive stellar explosion that occurred between 5,000 to 8,000 years ago. ... The filaments of gas and dust visible here in ultraviolet light were heated by the shock wave from the supernova, which is still spreading outward from the original explosion. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B09509B1C-2FD6-4410-A47C-0701A41550E6%7D
• Blowing bubbles in the Carina Nebula | Astronomy.com
• June 2007 | Astronomy.com

Next: The Evolutionary Status of Up: No Title Previous: Massive X-ray Binaries . After 25 years of pulsar studies, a radiopulsar has been discovered in a binary system with a massive optical companion (Johnston et al. ... As shown in the very first calculations of joint evolution of NS and normal stars in binaries (Kornilov and Lipunov, 1983b[ 86 ]) a considerable fraction (maybe, the majority) of NS in binary systems having an optical companion must be at the ejector љ (E) state. ... Systems . ...

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• My publications
• Massive X-ray Binaries
• The Evolutionary Status of Radiopulsars in Massive Binary Systems